Definition of gallus in English:

adjective

This leads the gallus Glaswegian to look up an old flame, an expert in ley lines and mysticism who sets him on a trail of ancient burial routes that leads him deep beneath the ancient foundations of a Glasgow church.

The gallus radio figure with his seemingly off-the-cuff put downs is in fact an intelligent and pleasantly modest fellow who researches his material meticulously.

A language has to be more than a few gallus Scotticisms scattered over standard English as a kind of local seasoning.